The one tip that I would add is something that I haven't seen so far and that is....

SHOOT A FEW GOOD ARROWS AND QUIT.

Don't wear yourself out training your brain/body to do it all wrong. When you shoot and shoot and shoot trying to make that form work your imprinting that worthless form. Work on aiming using the techniques listed previously. First I would try finding the peep/pin/trigger just on top of the target then relax down. Once on the spot let the pin slowly circle the bull, the circles will get tighter and gently squeeze the release. It should be a suprise when it goes off. It's great to have someone else doit but you have to learn on your own. Do this a time or two then QUIT. Wait an hour or so then go do it again. Once you can shoot this way 5 good arrows 3 times a day then you can drop your targets size to no bigger than a 2" target. Then hit it a few times and quit. Practice does not make perfect...PERFECT PRACTICE MAKES PERFECT!

To qualify this let me tell you that I once drew a practice lane next to what was the worlds top shooter at that time. I watched every move. He had a sight issue after a long airline handling. He would shoot, adjust the sight then sit for 5 solid timed minutes. I asked why, he said he didn't want his brain to associate that shot form with a miss. He had to wait between each shot till he had it hitting like he wanted. Once he hit an x he proceded to dump 4 more in the x. Then he went on to shoot a perfect 60x round. He also taught me a couple other tricks about tuning and aiming. But the one thing he stressed was that form was a mental issue more than a physical one and you had to train your brain to do the exact steps the same way time and again to acheive the desired response so that at no time did you have to consiously think about any step. Your subcounsious takes over and does it time and time again.
I used to play the song....The devil went down to Georgia in my mind over andover to keep my consious thought busy while my subcounsious drew,aimed and shot.